//-------------------------------------------------------------------------------------------------------+
// Copyright (C), 1998-2007, Beijing Tangent Software Co. Ltd.
// = FileName	:   TGAPopulation Àà
// = Version	:   ver2.0
// = Author		:   wlw
// = CreateDate	:   2002-09-09
// = Description:   TGAPopulation ¶¨Òå
// = Maintainers: 
//                  
//-------------------------------------------------------------------------------------------------------+
#include "StdAfx.h"
#include "TGAPopulation.h"
#include "TArray.h"

TGAPopulation::TGAPopulation()
	: m_iMaxNum(100),m_iMutationRatio(10),m_iEvolution(0)
{

}

TGAPopulation::~TGAPopulation()
{

}

bool TGAPopulation::IsContinue()
{
	return true;
}

void TGAPopulation::Step()
{

}

void TGAPopulation::SetMaxNum(long num)
{
	m_iMaxNum = num;
}

long TGAPopulation::GetMaxNum() const
{
	return m_iMaxNum;
}

void TGAPopulation::SetMutationRatio(long r)
{
	m_iMutationRatio = r;
}

long TGAPopulation::GetMutationRatio()
{
	return m_iMutationRatio;
}

void TGAPopulation::Append(TGAIndividual* pNew)
{
	if(pNew != NULL)
	{
		BFindDataTo(*pNew);
		InsertCur(pNew);
	}
}

void TGAPopulation::Evolve()
{
	TArray<TGAIndividual*> parent(*this);
	long last = GetLastIndex();
	long s = GetLength()*GetLength();
	for(long i = 0; i < parent.GetLength() && IsContinue(); i++, Step())
	{
		long r = rand();
		long j = last - ((long)sqrt((double)(r % s)));

		(*parent[j]).Multiply(*parent[i],this);  
		j = r % parent.GetLength();
		(*parent[j]).Multiply(*parent[i],this);
	}
	parent.Clear();
	
	while(GetLength() > GetMaxNum())
	{
		DelTail();
	}
	
	long num = GetMaxNum() * m_iMutationRatio / 100;
	for(i = 0; i < num && IsContinue(); i++, Step())
	{
		MoveTo(rand() % GetLength());
		Append(GetCurData()->Mutation());
	}
	m_iEvolution++;	
}